Energy System Planning under Uncertainty
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1 Energy System Planning under Uncertainty 24 July 2013 Jose Mojica Ian Greenquist John Hedengren Brigham Young University
2 Global Energy Production Energy Production (BBOe) Year 24 July
3 Overview PRISM Group Overview Dynamic Optimization for: Unmanned Aerial Vehicles Systems Biology Solid Oxide Fuel Cells Energy Storage and the Smart Grid Investment Planning Under Uncertainty Needs and resources for dynamic optimization 24 July
4 PRISM Group Methods Mixed Integer Nonlinear Programming (MINLP) Dynamic Planning and Optimization Uncertain, Forecasted, Complex Systems Research Applications Unmanned Aerial Vehicle (UAV) control Systems biology and pharmacokinetics Oil and gas exploration and production Hybrid and sustainable energy systems Chemical Engineering
5 Problem Formulation Standard Problem Formulation max subject to,,, h,, 0 0 Objective Function (f(x)) Dynamic model equations that relate trajectory constraints, sensor dynamics, and discrete decisions Uncertain model inputs as unmodeled or stochastic elements Solve large-scale MINLP problems (100,000+ variables) 24 July
6 Smart Grid Optimization Smart grid integration with solar, wind, coal, biomass, natural gas, and energy storage Nuclear integration with petrochemical production, processing, and distribution
7 Nuclear with Petrochemical Industries Electricity Heat Water Hydrogen Other 12% of total U.S. energy use from refining and chemicals $57 billion annually on energy Potential refinery and nuclear integration with electricity, heat, hydrogen, and other production-consumption pairings Transportation fuels are 28% of U.S. energy total
8 Underwater Oil Rigs Petrobras, a Brazilian oil company, plans to use unmanned, highly automated underwater oil rigs beginning in 2020 Nuclear reactors for: Electricity Heated pipe in pipe to discourage hydrate formation Gas, water, oil processing
9 Nuclear for Water Purification Cooling towers purify and consume 1.05 gal/kw-hr Several nations have access to nuclear power, but limited amounts of renewable fresh water World s largest desalination facility in Saudi Arabia to produce electricity and water (July 2013) KSA desalination consumes 300,000 barrels of oil per day at $3.20/m 3
10 District Heating and Cooling
11 Planning of Investment Decisions
12 Electricity Demand (MW) District Energy Profiles Heat Demand (MMBTU/hr)
13 Uncertainty in Natural Gas Prices
14 Uncertainty in Electricity Prices
15 Create Model: Simplifying System Electric and Heating Demand Model (winter and summer) MW
16 Allocation of energy supply Summer Electricity Supply Allocation? Winter Heating Capacity Allocation?
17 Dynamic Model for Dynamic System Electricity Demand (MW) Heat Demand (MMBTU/hr)
18 Nonlinear DAE Nonlinear DAE m n environmental operating capital u y x u y x h u y x g u y x t x f s t Cost Cost Cost u y x J, ),, ( 0 ),, ( 0,,, 0.. ) ( ),, ( min Nonlinear Cost functions Turbine and boiler dynamics Demand and operating constraints
19 Dynamic Optimization Results Both capacity increase and cost effective mode of operation over a long term horizon
20 Turbine Max Capacity
21 Supplemental Boiler Firing Capacity
22 Model Predictive Control Approach
23 L1 Norm formulation L1 Norm formulation 0,,, 0,,, ) ( ˆ ˆ 2 2 ),, ( 0.. min lo hi lo hi lo hi lo hi environmental operating capital lo hi model lo hi meas lo lo hi hi lo lo lo hi hi hi lo gap hi gap lo hi lo hi c c e e sc sc se se Cost Cost Cost c c w e e w obj sc x x c sc x x c se x m e se m x e m m m m m m d x x f s t sc sc se se obj
24 Optimize to a Target Range 5 Manipulated Optimal sequence of moves given uncertainty in the parameters u opt Distribution of Controlled Variables x opt Controlled
25 Optimize to a Limit Manipulated Conservative movement based on worst case CV u opt Controlled 10 5 Upper Limit x opt
26 Dynamic Solution
27 Dynamic Energy System Tools Toolbox for Object Oriented Modeling in MATLAB, Simulink, and Python Solid Oxide Fuel Cell (SOFC) Advanced tools are required for collaborative modeling and high performance computing
28 Optimization Benchmark 100 Success Speed APOPT+BPOPT Percentage (%) Speed and Success with combined approach APOPT 1.0 BPOPT 1.0 IPOPT 3.10 IPOPT 2.3 SNOPT MINOS Summary of 494 Benchmark Problems Not worse than 2 times slower than the best solver ()
29 Conclusions Powerful insights can be gained from modeling and data reconciliation over long periods of historical data When data, modeling, and optimization are combined, hidden savings are discovered through dynamic optimization MPC approach can allow for other control variables to be accounted for directly in optimization Simulation and optimization of energy system can give stake holders realistic options to evaluate risks and rewards with minimum cost Simulation results can then be directly applied to control applications
30 Development Needs Collaborative modeling tools Library of high quality models that are open source and can be adapted to new problems Improvements to methods to simulate and optimize largescale and complex systems Interface with operations and subject matter experts need to know the process for effective modeling and optimizing
31 Acknowledgements
32 Extra Slides
33 Systems Biology Objective: Improve extraction of information from clinical trial data Dynamic data reconciliation Dynamic pharmacokinetic models (large-scale) Data sets over many patients (distributed) Uncertain parameters (stochastic) 8 HIV Virus Simulation log10 virus Log(Virus) Time 1.95 Log(kr 1 ) time (years)
34 Energy System Model
35 LP (Linear Programming)
36 Example of Results LP or NLP formulation, optimizing through discrete scenarios to account for uncertainty. Lacks system dynamics.
37 Electricity Generation Forecasts
38 Optimize capacity at CHP s most efficient operating point
39 Heat load is optimized simultaneously
40 Optimize to a Target
41 Optimize above a Limit
42 Simultaneous vs. Sequential Table 1: Computational results from the sequential and simultaneous solution methods. Computations for each method are executed using an Intel Core 2 Duo (2.54 GHz) processor with 4 GB RAM. Sequential Simultaneous Objective function value System model evaluations 3,336 1 Computation time (s) K.M. Powell, J.D. Hedengren, T.F. Edgar, A Continuous Formulation for Logical Decisions in Differential Algebraic Systems using Mathematical Programs of Equilibrium Constraints, Industrial and Engineering Chemistry Research, Submitted, 2013.
43 Survey of DAE Solvers Software Package Max DAE Index Form Adaptive Time Step Sparse Partial DAEs Simultaneous Estimation / Optimization APMonitor 3+ Open No Yes No Yes DASPK / CVODE / Jacobian 2 Open Yes No No No gproms 1 (3+ with transforms) Open Yes Yes Yes No MATLAB 1 Semiexplicit Yes No No No Modelica 1 Open Yes Yes No No DAE = Differential and Algebraic Equation
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